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Editorial
The ground-free ECG recording scheme with two electrodes is noted to be useful only in specific applications, such as biotelemetry devices with small ground-referenced capacity.
This comment seeks to point out that the ground-free ECG recording with two electrodes scheme proposed by Thakor and Webster1 appears to be useful only in certain applications. Many biotelemetry devices work successfully with two-electrode single-ended input amplifiers since their ground-referenced capacity is so small that 60 Hz line coupled displacement currents do not cause interference.
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Bruce C. Towe (1981) studied this question.
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